Isomerization of cyclohexanedicarboxyt, i0 acid rstchs

ABSTRACT

ORGANIC CARBOXYLIC ACIDS HAVE BEEN FOUND TO BE ACTIVE CATALYSTS FOR THE ISOMERIZATION OF CIS-1,4- AND CIS-1,3-CYCLOHEXANEDICARBOXYLIC ACID DIALKYL ESTERS INTO THEIR CORRESPONDING TRANS DERIVATIVES. THE PREFERRED ISOMERIZATION CATALYSTS ARE THE DICARBOXYLIC ACIDS AND THEIR MONOESTERS, (SUCH AS TRANS-1,4-CYCLOHEXANEDICARBOXYLIC ACID OR ITS MONOESTER), SINCE THESE COMPOUNDS NEED NOT BE REMOVED FROM THE PRODUCT PRELIMINARY TO USED OF THE ISOMERIZATE PRODUCT IN POLYESTER MANUFACTURE.

D FENSIV PULEQA'HUN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JUNE 26, 1973 T011320 ISOMERIZATKON OF CYCLOHEXANE- DICARBOXYLIC ACID ESTERS Theodore Edward Stanin, 1300 Greenfield Place 37662, and Robert Estes Gee, In, 2140 Swannanoa Ave. 37664, both of Kingsport, Tenn. Continuation of abandoned application Ser. No. 114,432, Feb. 11, 1971. This application Nov. 3, 1972, Ser.

Int. Cl. C07c 69/74 U.S. Cl. 260-468 K 2 Sheets Drawing. 11 Pages Specification Organic carboxylic acids have been found to be active catalysts for the isomerization of cis-1,4- and cis-1,3-cyclohexanedicarboxylic acid dialkyl esters into their corresponding trans derivatives. The preferred isomerization catalysts are the dicarboxylic acids and their monoesters, (such as trans-1,4-cyc1ohexanedicarboxylic acid or its monoester), since these compounds need not be removed from the product preliminary to use of the isomerizate product in polyester manufacture.

June26, 1973 ETAL ISOMERIZATION 0F CYCLOHEXANEDICARBOXYI.H; ACIU HSIERS Qriginal Filed Feb. 11, 197l 2 Sheets-Sheet 1 'SNVELL ,JR VZTORS ATTORNEYS June 25, 1973 E. STANIN E AL 1911,02!)

ISOMERIZAT-ION OF CYCLOHEXANEDICARBOXYLIC ACID HSTERS Original Filed Feb. 11, 1971 2 Sheets-Sheet? N 5 E E a 5 52 h W 5% UL) Q] L L W 1 L E 1 \2fl L 1 1 O O O O (Q1 THEODORE ESTANIN SNVHL ROBERT E. GEE JR. INVE TORs (Quit j BY ATTORNEYS 

